r53-ddns.sh

#!/bin/bash
new_ip="$(curl -s -4 http://api.ipify.org)"
zone_id=$1
target_name=$2

batch_json='
{
  "Changes": [{
    "Action": "UPSERT",
    "ResourceRecordSet": {
      "ResourceRecords": [
          {
              "Value": "'$new_ip'"
          }
      ],
      "Type": "A",
      "Name": "'$target_name'",
      "TTL": 300
    }
 }]
}'

echo "$zone_id/$target_name =  $new_ip"
echo "--"
echo "${batch_json}"
echo "vv"

aws route53 change-resource-record-sets \
  --hosted-zone-id $zone_id \
  --change-batch "${batch_json}"